On It nor Species of Pariiassius. 47 



Locality. Off the soutli-rast coast of Arabia ; SjS fathoms. 

 Several speeimeiis on tlie plcopods of BafJ/t/itomufi f/if/frnfeiis'. 



This species appears to he rehvted to D. Iloeki, Stebl)ing*, 

 which was found on the gills of an American Palinnrid. 



XI. — Description of a new Species of Parnassius. 

 By F. M'oouE, D.Sc., F.Z.S. 



Parnassius Balacha. 



Male. — Upperside railk-wliite. Fore icing with the costal 

 border basally irrorated with black scales, the basal area 

 densely black-scaled ; a dense black bar across middle of the 

 cell, but not touchino^ the median vein ; a shorter black bar 

 at upper end of the discocellular vein, followed close beyond 

 by an irregular-shaped, longer, outwardly oblique bar, 

 enclosing three crimson spots, tliis latter bar extending from 

 tlie first subcostal branch to ui)per median brancli, and its 

 inner edge very slenderly joined to the discocellular bar by 

 black scales along the intervening veinlets ; the outer margin 

 of the wing is bordered by a black-scaled decreasing band, 

 which is broad anteriorly and slender posteriorly, and is 

 traversed by a series of seven white rounded spots — one each 

 placed between the veins, the upper one being more inwardly 

 positioned towards the costa, the outer marginal edge of the 

 black band formed of diagonally-quadrat6»portions, each of 

 the latter including its contiguous cilia. Hind icing with 

 the base and upper part of the abdominal margin blick- 

 scaled ; a small black-scaled crimson-centred spot on middle 

 of anterior margin and a similar discal spot beyond the cell; 

 a slightly defined blackish-scaled submarginal series of five 

 slender incurved lunulcs, the lower three being less defined, 

 and each joined at the veins to a similar black-sealed marginal 

 line, which is posteriorly broken between the veins, and at the 

 vein-tips include their contiguous cilia. Thorax and abdo- 

 men blackish, clothed with long white hairs ; front of head 

 and palpi clothed with grey hairs; antennai greyish, the tip 

 white. 



Underside white. Fore wing with the three black bars as 

 on the upperside, but broader, the blackish-scaled outer band, 

 as on upperside, indistinctly defined, its most distinct portion 

 being that between the upper and middle median veinlets. 



* xVuu. & Mag. Nat. Hist. (6) xv. p. 18 (1895). 



